DC-900300-1.5, Duracast 300 Gallon Plastic Storage Tank | 900300 If you need a container to hold harmful chemicals, you want to be sure that the container will not deteriorate. Duracast’s 300 gallon vertical storage tanks are not your typical plastic container. These plastic storage tanks are made to be impact resistant so that you can enjoy stress-free storage for years. The polyethylene that is used to make these tanks has the ability to combat aggressive chemicals and keep them from wearing down the tank. These strong tanks are also lightweight and include convenient features like an 16-inch vented lid and gallon calibrations that are molded into the tank.